1 /*
   2  * Copyright (c) 2009, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 
  24 /*
  25  * @test
  26  * @bug 6855164
  27  * @summary SIGSEGV during compilation of method involving loop over CharSequence
  28  *
  29  * @run main/othervm -Xbatch compiler.loopopts.Test6855164
  30  */
  31 
  32 package compiler.loopopts;
  33 
  34 public class Test6855164 {
  35     public static void main(String[] args) throws Exception {
  36         StringBuffer builder = new StringBuffer();
  37 
  38         for(int i = 0; i < 100; i++)
  39             builder.append("I am the very model of a modern major general\n");
  40 
  41         for(int j = 0; j < builder.length(); j++){
  42             previousSpaceIndex(builder, j);
  43         }
  44     }
  45 
  46     private static final int previousSpaceIndex(CharSequence sb, int seek) {
  47         seek--;
  48         while (seek > 0) {
  49             if (sb.charAt(seek) == ' ') {
  50                 while (seek > 0 && sb.charAt(seek - 1) == ' ')
  51                     seek--;
  52                 return seek;
  53             }
  54             seek--;
  55         }
  56         return 0;
  57     }
  58 }